CVE-2013-0776: n/a vulnerability

CVE-2013-0776: Mozilla Firefox before 19.0, Firefox ESR 17.x before 17.0.3, Thunderbird before 17.0.3, Thunderbird ESR 17....

Mozilla Firefox before 19.0, Firefox ESR 17.x before 17.0.3, Thunderbird before 17.0.3, Thunderbird ESR 17.x before 17.0.3, and SeaMonkey before 2.16 allow man-in-the-middle attackers to spoof the address bar by operating a proxy server that provides a 407 HTTP status code accompanied by web script, as demonstrated by a phishing attack on an HTTPS site.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 6, 2024, 14:41 UTC (UTC+00:00)

Security readout for executives and security teams

This is an old Mozilla client spoofing issue. An attacker positioned as a proxy or network intermediary could make a vulnerable browser or mail client show a misleading address bar, supporting phishing against HTTPS sites. The provided sources do not show active exploitation. Exposure is most likely on legacy endpoints still running Firefox before 19.0, Firefox ESR 17.x before 17.0.3, Thunderbird before 17.0.3, Thunderbird ESR 17.x before 17.0.3, or SeaMonkey before 2.16. Treat as a legacy-client phishing risk. Prioritize remediation where old Mozilla products remain on managed endpoints, kiosks, jump boxes, or environments using explicit web proxies. Mitigation focus: Upgrade affected Mozilla products to fixed versions or later.; Apply distribution security updates from Debian, Ubuntu, Red Hat, or openSUSE where applicable.; Retire unsupported legacy Mozilla browsers and mail clients..

Prepared: Jun 24, 2026, 11:46 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Feb 19, 2013, 23:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

3Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
https://bugzilla.mozilla.org/show_bug.cgi?id=796475CVE reference · x_refsource_CONFIRM
oval:org.mitre.oval:def:16666CVE reference · vdb-entry, signature

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

No CWE listed

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